Wong, Poh Lee

L’utilisation de techniques informatiques pour la reconnaissance et l'identification des poissons est devenue assez populaire parmi les chercheurs. Ces nouvelles approches sont importantes, puisque les informations extraites sur les poissons telles que leurs trajectoires, leurs positions ou leurs couleurs, permettent de déterminer si les poissons sont en bonne santé ou en état de stress. Les méthodes existantes ne sont pas assez précises notamment lorsque des éléments tels que les bulles ou des ...

Marushka, Lesya

Traditional food is fundamental for the cultural identity, mental and spiritual well-being, and physical and nutritional health of First Nations in Canada. Rapid environment changes including environmental contamination and degradation, climate change, urbanization and industry growth reduce the availability and diversity of traditional foods. This is concomitant with changing lifestyle and an increased prevalence of malnutrition, obesity, diabetes, and cardiovascular diseases. The goal of this ...

Ellender, Bruce Robert, Weyl, O L F, Winker, Henning

South African inland fisheries are poorly developed and their contribution to near-shore communities is poorly understood. This study is the first comprehensive assessment of recreational and subsistence angling undertaken in an inland fishery in South Africa. The study was conducted on the 360 km2 Lake Gariep, South Africa’s largest freshwater reservoir. A total of 508 anglers were interviewed between February 2007 and January 2008. Of those interviewed, 67% were subsistence anglers and 33% rec...

Taylor, Geraldine C, Weyl, Olaf L F, Hill, Jaclyn Marie, Peel, Richard A, Hay, Clinton J

The Upper Zambezi, Kavango and Kwando are large floodplain rivers with substantial biodiversity, providing water and ecosystem services to a large tract of southern Africa. These rivers differ in hydrological regime. The Upper Zambezi and Kavango rivers are in flood for 4 months (March, April, May, June) while, in the Kwando River, floods are later and last for 1–2 months in July and August. The Upper Zambezi River has the largest annual flood pulse, followed by the Kavango River, while the Kwan...

Poggenpoel, Cedric Alan

Bibliography: pages 202-225. / This thesis describes the fish remains recovered from a number of sites in three different localities in South Africa; Elands Bay and Langebaan Lagoon on the west coast, and False Bay on the Cape Peninsula. Chapter One is an introductory account of ichthyology, its usefulness in archaeological research and the range of analytical work done in South Africa, whilst Chapter Two is an attempt to show the history and development of the study of fish bones recovered from...

Mann, Peter J

Bibliography: leaves 134-143. / The study was initiated as a result of a growing concern of the researcher at the apathy prevalent amongst his students at Fish Hoek Senior High School towards environmental activities which took place out of'school hours. Linked to this was a perceived lack of understanding of environmental issues and very little commitment towards positive environmental actions such as recycling. These were students in the final phase of their secondary education at a school sit...

abstract: Newfoundland is an island on the east coast of Canada that is mostly forgotten to the study of history. This paper looks in depth at the fighting between France and England between 1696 and 1713, which in Europe coincided with the Nine Years’ War and the War of the Spanish Succession. In 1696, fighting broke out on Newfoundland between England and France because of the Nine Years’ War. Pierre le Moyne d’Iberville, a French officer, commanded the attacks on over twenty English settlemen...

Garduno, Rafael A ngel

The fish pathogenic bacterium Aeromonas salmonicida is the causative agent of furunculosis in salmonids, a systemic disease that causes important economic losses in salmon aquaculture. Since the paracrystalline S-layer of Aeromonas salmonicida, known as the A-layer, is essential for virulence, the virulence mechanisms associated with this structure were studied. Structural studies demonstrated that the A-layer is flexible and plastic, being capable of acquiring different conformations and/or ...

Mpofu, Christopher

This thesis presents an evaluation of the dispersive solid-phase extraction (d-SPE) method referred to as the quick, easy, cheap, effective, rugged and safe (QuEChERS) method for the determination of four organochlorine pesticide residues in fish samples. The pesticides investigated in this study were o, p′-DDT, p, p′-DDE, aldrin and dieldrin. The combined use of Gas Chromatography with an Electron Capture Detector (GC-ECD) and sensitive Time of Flight (TOF) mass detector facilitated the identif...

Kinghorn, James Wolmarans

Experience has shown that effective fisheries governance requires a sound understanding of fisheries as systems incorporating both ecological and human dimensions. The Ecosystem Approach to Fisheries requires that the human components of these systems be considered when developing management and governance frameworks. While the potential for inland fisheries to contribute towards societal welfare and the development of rural livelihoods is becoming increasingly apparent, developing South African...

Peters, Kathleen

Eigenmannia virescens is a gymnotiform weakly electric fish which uses a quasi-sinusoidal electric organ discharge (EOD) to sense their environment. EOD frequency (EODF) is individual-specific. In conspecific interactions, each fish perceives the EODF of the conspecific as a periodic amplitude modulation (AM) of their own discharge. When both fish are stationary, the depth of this AM is constant, but it varies when fish are swimming. We hypothesized that AM variations during swimming act as a no...

Mbatha, Fisokuhle Lungile

ABSTRACT Spawning times and spawning intensity during the life cycles of some fish species found off South Africa and Norway were synthesized using data collected from the literature. The comparison of temporal patterns in spawning of South African fish species showed variable spawning times and intensity depending on the environmental conditions within that spawning habitat. Their spawning migration durations were suggested to be short since they inhabit a dynamic coastal upwelling ecosystem wi...

Dickens, John

Over-exploited fisheries result in global economic losses and can lead to the degradation of marine ecosystems. Commercial and recreational fisheries have grown substantially over the past decades placing fish stocks under increasing pressure. Fisheries management aims to conserve and restore stocks to economically and environmentally sustainable levels. Stock assessments are mostly based on analyses of fishery-dependent data, however, this practice often neglects uneconomically important specie...

Jackson, Latonya

<p> This study assed the impacts of 17&alpha;-ethinylestradiol in Heterandria formosa. These impacts were addressed through chronic, life-cycle exposures of individuals and populations of least killifish to 0, 5, or 25ng/L EE2. Development, growth, reproduction, survival, and population dynamics were monitored and evaluated for EE2 effects on their health, reproductive success, and population sustainability. </p><p> Exposing pairs of least killifish to EE2 resulted in similar increases in time...

Ertong, Berke, Vilhelmson, Oskar

No description available.

Weintroub, Jonathan

A means of assessing the quantity of exploitable fish in the sea is a requirement for effective management of the resource. Sonar is widely used in this regard, as it provides a rapid means of assessment. Two acoustic assessment techniques currently used are the echo counting and echo integration· methods. The echo counting method requires that only single fish echoes are present in the backscatter from the shoal, while the echo integration technique requires an a-priori knowledge of the average...

Jonsson, Fritjof

It has been investigated if it is possible to selectivly catch farmed salmon (Salmo salar L., 1758) and sea trout (Salmo trutta L., 1758) without disturbing the wild fish. A image analysis software that can separate wild from farmed salmon and salmon from sea trout has been developed. This is interesting since the advent of hydro power stations has obstructed the natural migration of these species to their natal river streams. Even though ladders have been built, fewer fish find their way back u...

Nyqvist, Daniel

Hydropower dams block migration routes and disrupt longitudinal connectivity in rivers, thereby posing a threat to migratory fish species. Various fish passage solutions have been implemented to improve connectivity with varying success. A well-functioning passage solution must ensure safe and timely passage routes that are used by a substantial portion of the migrating fish. In this thesis, I report the results from telemetry studies where the behavior and survival of migrating Atlantic salmon ...

Troia, Matthew John

Doctor of Philosophy / Department of Biology / Keith B. Gido / A fundamental goal of ecology is to understand environmental associations of species. These associations can provide a basis for predicting spatial distributions in contemporary habitats as well as how those distributions might change in response to anthropogenic environmental change. Developing species distribution models is limited by an incomplete understanding of functional traits, spatial scaling, and the mechanisms and generali...

Mitterer, Lana Gayle

Analysis of larval fish collected at four stations in a 330-ha cooling reservoir indicated Dorosoma spp. were most numerous at all stations, followed by Lepomis spp. and Percina Macrolepida. Largest numbers and greatest diversity of larval fish were found at the station least affected by thermal effluent; the mid-lake station provided the smallest numbers and least diversity. The two warmwater stations were intermediate, with similar numbers and diversity. Diversity and abundance of zooplankton...

Taylor, William Nelson

Earl suffers from a guilty obsession with a monster catfish. Eddie Klomp searches dog tracks for the ghosts of his lost childhood. Mike Towns is a hopeless blues musician who loses everything he cares for. Blair Evans learns to love a pesky wart. Americana becomes confused with the difference between knowledge and sex. Do Not Eat Fish from These Waters And Other Stories is a collection of short stories that explores the strange and often defeated lives of these Southern characters (and one from ...

Bauml, George A. (George Arthur)

This study was designed to determine if impingement and entrainment by cooling water intake at the Comanche Peak Steam Electric Station have an adverse impact upon the Squaw Creek Reservoir fish population. The yearly impingement of fish was estimated to be 262,994 of 14 species. The threadfin shad (Dorosoma petenense) accounted for 96% of this total. Entrainment of eggs and larvae for a five month period was estimated to be 15,989,987 and 42,448,794 respectively. Two fish population studies wer...

Wise, Patricia D. (Patricia Diane)

This study evaluated the effects of chlorinated effluent discharged from the City of Denton, Texas' wastewater treatment plant on Pecan Creek's fish and macroinvertebrate assemblages, and their recovery upon dechlorination. A baseline of ecological conditions was established while chlorine was present in the effluent (June 1993- October 1993), and was evaluated again after dechlorination with sulfur dioxide (October 1993-August 1994). In situ Asiatic clam and fathead minnow ambient toxicity test...

Shelton, Peter Anthony

Bibliography: pages 320-327. / A 120 station grid was surveyed at monthly intervals in the southern Benguela. Current system between August 1977 and August 1978. Plankton was collected at each station by means of a double oblique tow behind the ship at 2 knots down to 100m or 5m off the bottom. Plankton displaced volume was determined and all fish eggs and larvae were removed and identified to the lowest possible taxon. Water samples were collected at each·station by means of 5 litre bottles fro...

LaBone, Elizabeth Dawn

The Louisiana-Texas coast is one of the largest areas of seasonal, coastal hypoxia. The hypoxic zone has increased in size since the 1900s and has significantly increased in thickness since 1985. Hypoxia can negatively affect fish through direct mortality, reduced fecundity, and reduced preyavailability. Movement algorithms were used to model fish movement and avoidance of hypoxia in 2-D and 3-D with static and dynamic environmental fields. Output from a 3-D, coupled, hydrodynamic-water quality ...

Karthigan, G

Ionic polymer metal composites (IPMC) are a new class of smart materials that have attractive characteristics such as muscle like softness, low voltage and power consumption, and good performance in aqueous environments. Therefore, there is a significant motivation for research on design and development of IPMC based biomimetic propulsion systems for underwater vehicles. In aerospace, underwater vehicles finds application for forensic studies of spaceship wrecks, missile fragments and any airpla...

abstract: Background: Research in animal models suggests that fish oil ingestion may impair immunity and increase risk for infection. To date there are no studies examining this relationship between fish oil ingestion and risk for infection in humans. Objective: The primary aim of this randomized, placebo-controlled, double-blind, parallel-arm study was to examine the effect of 400 mg of EPA and 200 mg of DHA, the main components of fish oil (FO) supplements, on the incidence of symptoms related...

Cowley, Paul D (Paul Denfer), 1964-

The primary aim of this study was to investigate the population dynamics of the fishes associated with a small (17.5 hectares) temporarily open/closed estuary on the south east coast of South Africa. The results are based on the findings of an intensive sampling programme conducted over a period of four years in the East Kleinemonde estuary (33° 32' S : 27° 03' E). By adopting a quantitative approach, this study addresses the need for information on estuarine-associated fish population sizes, st...

Bowen, Stephen H

The feeding of the cichlid fish Sarotherodon mossambicus in Lake Sibaya, KwaZulu, was studied in relation to various biotic and abiotic features of the l ake environment from January, 1973 to July, 1975. The primary goal of the study was to determine the cause of stunting and poor condition of adults in this population. Juvenile and adult S. mossambicus feed on a mixture of detritus, bacteria and diatoms that occurs as a flocculent layer on sand substrates throughout the lake. Concentrated gastr...

George, Dashwill Anton

Thesis (MTech (Biomedical Technology))--Peninsula Technikon, 2003 / Increased seafood consumption due to its nutrition and promotion of a healthy diet has lead to more frequent reports of allergic reactions. In the seafood industry, workers are exposed to the antigens through inhalation of the vapours created during the seafood processing and cooking. Most seafood allergens are stable molecules, which are resistant to the effect of cooking and processing. The prevalence of occupational...

Martinez, Maria L., 1960-

The Trinity River passes through the Dallas-Fort Worth metroplex receiving point and non-point source contaminant loadings. Lepomis spp. were collected at twelve sampling locations in the Trinity River in August 1987 and September 1988 and analyzed for organochlorine pesticides and heavy metals. Results from the study were compared to existing U.S. FDA action and tolerance levels, LC50s, and historical data. Various longitudinal trends and some concentration patterns were observed. Continual stu...

Cienciala, Piotr

Spatial heterogeneity and arrangement of physical habitat strongly influence stream-dwelling organisms. A primary objective of this dissertation was to examine how hydrogeomorphic controls – channel morphology, bed sediment, and flow hydraulics – shape spatial patterns of habitat for small-bodied trout. Two complementary habitat types, spawning and foraging habitat, were investigated to gain more comprehensive understanding of these linkages. A secondary objective of the dissertation was to eval...

Kuo, Freiya

The effect of temperature on biochemical adaptation in the eurythermal fish Gillichythes mirabilis, long jaw mudsucker, was studied with respect to two questions: (a) How much restructuring of overall tissue proteins occurs with acclimation to cold and warm temperatures, and (b) how does the nature of protein restructuring relate to eurythermy? Much literature exists showing temperature acclimation induces changes in proteins and enzyme functions, and that these changes may be short term or long...

Hanson, Linda Marie

Exercise is an integral part of the survival of vertebrates. However, intense exercise disrupts extracellular homeostasis, resulting in venous blood becoming hypoxic, hyperkalemic and acidotic. These changes challenge the heart, as the venous blood passing through the ventricular lumen is the sole source of myocardial support for most vertebrates. Consequently, during exercise when the heart is working its hardest it must ironically be supported by the hostile composition of venous blood. Rainbo...

Todgham, Anne Elizabeth

Although there are a large number of studies on the role of heat shock proteins (Hsps) in stress tolerance, this literature consists mainly of studies conducted in the laboratory, making a comprehensive understanding of the ecological significance of Hsps in an animal's natural stress tolerance difficult to obtain. The rocky intertidal is an ideal environment in which to examine the physiological and biochemical responses of organisms to changing abiotic factors and to investigate mechanism...

Butler, Caroline F.

Through ethnographic research based primarily in Prince Rupert, British Columbia, this dissertation explores the ecological and social significance of commercial fishers' political knowledge. Moving beyond the ecological thrust of local knowledge research, this ethnography emphasizes the material and political basis of fishers' perceptions and understandings. The study focuses on the politicized experience of commercial fishers in resource management contexts and the way in which their kno...

Whitfield, Kyly C

Background: Infantile beriberi, a consequence of maternal thiamin deficiency, is not uncommon in Cambodia. The Cambodian diet consists largely of thiamin-poor, polished white rice and contains few thiamin-rich foods. Objectives: 1) Determine the thiamin status, assessed by erythrocyte thiamin diphosphate concentration (eTDP), among Cambodian women of childbearing age; 2) develop a stable and acceptable thiamin-fortified fish sauce; and 3) test the efficacy of thiamin-fortified fish sauce to inc...

McKenzie, David J.

Aspects of ventilation and ventilatory control were investigated in an air-breathing fish, Amia calva, to determine the extent to which Amia is similar to water-breathing fish. The possibility that Amia uses the air-breathing organ to maintain gas-exchange during periods of aestivation was tested. During gradual air-exposure, Amia showed no reduction in oxygen consumption, no increase in plasma urea levels or in urea excretion. Arterial blood pH (pHa) remained constant, and arterial plasma tota...

Tufts, Bruce Laurie

The characteristics of the ion exchange mechanisms which regulate volume and pH in fish and amphibian erythrocytes were investigated and compared. Experiments were carried out under steady state conditions and also following adrenergic stimulation both in vivo and in vitro. Under steady state conditions, a decrease in extracellular pH caused an increase in the volume of rainbow trout erythrocytes, and a decrease in the intracellular pH. These pH-induced volume changes were mainly associated wit...

Ferguson, Sean

The cross-sectional form of semi-alluvial bedrock channels was investigated. Channel geometry data were collected from a variety of streams in Ontario and Québec, Canada to develop empirical downstream scaling relationships. The relationships revealed that bedrock, mixed, and alluvial channels scale at similar rates with respect to discharge. The widest channels were formed in low-relief sedimentary bedrock with minimal alluvial cover. Channels influenced by resistant igneous/metamorphic bedrock...

Tzaneva, Velislava

Endogenously produced carbon monoxide (CO) is an important gaseous signalling molecule which regulates a variety of cardiorespiratory functions. CO is produced in cells by the heme oxygenase (HO) family of proteins by the breakdown of heme into equimolar amounts of CO, bilirubin and Fe2+. My thesis focuses on the hypoxia- and hyperoxia-inducible HO-1/CO system exclusively and aims to provide the first evidence that the HO-1/CO system is involved in cardiorespiratory control in the zebrafish (Dan...

Dobson, Geoffrey P.

The aim of the present investigation was to examine the control of anaerobic glycogenolysis in working and fatigued skeletal muscle. The two animals chosen for the study were a teleost fish and the laboratory rat. The rationale behind using a comparative approach to investigate fundamental questions on metabolic control resides in the different abilities of each animal to perform exercise, and to their markedly different myofibrillar organization. In the process of defining the hierarchical rec...

Arnason, Ragnar

A detailed model describing the economics of harvesting self-renewable resources is constructed. The model is developed in terms of the particular case of the Icelandic demersal fisheries. Its basic structure is nevertheless general enough to apply to a wide range of other self-renewable natural resources. The model involves a biological submodel, describing the internal dynamics of the resources, an economic submodel, describing the technology and dynamics of the harvesting process, and a speci...

Fidler, Larry E.

The condition of Gas Bubble Trauma in fish was examined in terms of specific symptoms involving bubble development in the circulatory system and buccal cavities of fish. Based on a comparison between the conditions for bubble growth in fish exposed to supersaturated water and mammals exposed to hyperbaric and hypobaric decompression a mathematical model was developed describing environmental water threshold needed to initiate bubble growth in fish. The equation development yielded expressions wh...

Smith, Frederick Dabell

The behaviour reactions and the mechanisms involved in the injury and death of goldfish (Carassius auratus) exposed to chill temperatures have been investigated. Upon direct transfer to colder water goldfish exhibit an initial shock reaction followed by a primary chill-coma reaction with the latter reaction sometimes being followed, after apparently normal recovery, by a secondary chill-coma that ends in death. The first two reactions are believed to result from the effect of an excessive therma...

Ali, Mohammed Youssouf

Diurnal and seasonal variation in spatial distribution of fifteen species of fish were studied in Nicola Lake during summer. Maximum depth at which fish were taken was 110 ft. where only Kokanee were found. Peamouth Chub, Largescale Sucker and Prickly Sculpin were found in depths up to 80 ft. Chiselmouth were restricted to the shallow southwest basin all throughout summer. Carp fingerlings were also restricted to shallow weedy areas. All other species were available in all major regions of the l...

Cartwright, John William

Fecundity data were obtained for twelve species of British Columbia freshwater fishes by use of a displacement method. Data for an additional fourteen species were obtained from the literature. Fecundity relative to a unit body weight was considered superior to absolute fecundity for use in racial studies. Egg diameter was significantly larger in anterior than in posterior regions of ovaries from five species tested. Egg diameter was positively correlated with fork length within and between spec...

How, Thomas Gerald

[No abstract available] / Science, Faculty of / Physics and Astronomy, Department of / Graduate

Prempridi, Thamrong

Rates of mortality among young salmon passing through a high speed, model propeller, turbine operating under a 50 ft hydraulic head but under various, draft tube suctions are given. Effects, on both fish mortality and turbine performance, of admission of compressed air into the turbine at various locations to reduce the effect of cavitation (believed to be the major cause of fish mortality in the turbine) are discussed . At low turbine speed and low efficiency, admission of air immediately down...

Smith, John Clegg

By superimposing an artificial water flow over the gills out of phase with the natural breathing movements of the fish, it has been possible to demonstrate that bradycardia and cardiorespiratory synchrony develop in response to decreased peripheral oxygen levels. Further evidence that peripheral and not central receptors are involved was furnished by injecting deoxygenated blood into the dorsal aorta; no effect on heart rate or breathing was observed. Bradycardia still develops in response to h...